Ear clip type earphone

Abstract

Some embodiments of the present specification provide an ear clip type earphone, comprising: a sounding part configured to be inserted into a conchae cavity of a wearer when worn, the sounding part comprising: a housing having an accommodating cavity; the first sound driver and the second sound driver are jointly contained in the containing cavity, and a first sound transmission channel is formed between a first vibrating diaphragm of the first sound driver and a second vibrating diaphragm of the second sound driver; the sound outlet hole is formed in the shell, and the sound outlet hole is in acoustic communication with the first sound transmission channel and leads out sound generated by the first sound driver and the second sound driver; the abutting part is configured to abut against the back of the ear of a wearer when the earphone is worn; and the ear hook is configured to bypass the antihelix and the helix of the wearer during wearing and connect the sound production part and the abutting part.

Description

Ear clip-on headphones

[0001] Cross-references

[0002] This application claims priority to Chinese application No. 202311701969.7 filed on December 11, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of sound-producing instruments, and in particular to an ear-clip earphone. Background Art

[0004] With the development of acoustic output technology, acoustic devices (such as headphones) have been widely used in people's daily lives. They can be used in conjunction with electronic devices such as mobile phones and computers to provide hearing functions for the wearer. Ear clip headphones are a new type of headphones, which are usually small in size and can be clamped near the wearer's ear helix for use. When wearing ear clip headphones, the sound-emitting part will be extended into the concha cavity. The characteristic of not blocking the ear canal can ensure safety in outdoor scenes, and it is more comfortable to wear than in-ear headphones. However, due to the volume of the concha cavity, there are many restrictions on the volume of the sound-emitting part of the ear clip headphones, which to a certain extent leads to problems such as insufficient volume and unsatisfactory sound quality in the ear clip headphones.

[0005] Therefore, it is necessary to provide an ear clip type earphone to improve the output performance of the ear clip type earphone.

[0006] Summary of the Invention

[0007] An embodiment of the present application provides an ear-clip earphone, comprising: a sound-emitting portion, configured to be inserted into the wearer's cavum concha when worn, the sound-emitting portion comprising: a shell, having a receiving cavity; a first sound driver and a second sound driver, jointly accommodated in the receiving cavity, a first sound transmission channel being formed between a first diaphragm of the first sound driver and a second diaphragm of the second sound driver; a sound outlet hole, located on the shell, acoustically connected to the first sound transmission channel and deriving the sounds generated by the first sound driver and the second sound driver; an abutment portion, configured to abut behind the wearer's ear when worn; and an ear hook, configured to bypass the wearer's antihelix and auricle when worn, and connect the sound-emitting portion and the abutment portion.

[0008] In some embodiments, the ear hook has a first symmetry plane, the first diaphragm and the second diaphragm are respectively located on either side of the first symmetry plane, and the first diaphragm and the second diaphragm are symmetrical with respect to the first symmetry plane.

[0009] In some embodiments, the first symmetry plane passes through the sound outlet hole.

[0010] In some embodiments, the ear hook has a first symmetry plane, the first diaphragm and the second diaphragm are symmetrical with respect to the second symmetry plane, and an inclination angle less than 45 degrees is formed between the first symmetry plane and the second symmetry plane.

[0011] In some embodiments, the sound outlet is symmetrical with respect to a third symmetric plane, the third symmetric plane is perpendicular to the inner wall of the cavum concha, and an inclination angle less than 45 degrees is formed between the first symmetric plane and the third symmetric plane.

[0012] In some embodiments, when the wearer wears the ear-clip earphone, the sound outlet is completely located on a side of the first symmetry plane closer to the wearer's earlobe.

[0013] In some embodiments, the ear hook has a first symmetry plane, the first diaphragm and the second diaphragm are symmetrical with respect to a fourth symmetry plane, and the fourth symmetry plane is perpendicular to the first symmetry plane.

[0014] In some embodiments, when the wearer wears the ear-clip earphone, the sound outlet is completely located on a side of the first symmetry plane closer to the wearer's earlobe.

[0015] In some embodiments, the central axis of the sound outlet coincides with the central axis of the first sound transmission channel; the cross-sectional shape of the sound outlet perpendicular to its own central axis is the same as the cross-sectional shape of the first sound transmission channel perpendicular to its own central axis, and the entrance of the sound outlet is aligned with the opening of the first sound transmission channel.

[0016] In some embodiments, the first acoustic channel is a common front cavity of the first diaphragm and the second diaphragm.

[0017] In some embodiments, the first sound driver includes a first magnet and a first magnetic conductive cover arranged in sequence away from the first diaphragm, and a first basin frame for supporting the first diaphragm, the first magnet and the first magnetic conductive cover; the second sound driver includes a second magnet and a second magnetic conductive cover arranged in sequence away from the second diaphragm, and a second basin frame for supporting the second diaphragm, the second magnet and the second magnetic conductive cover.

[0018] In some embodiments, a second sound transmission channel is formed between the first basin and the second basin, the first basin includes a plurality of first air holes, the second basin includes a plurality of second air holes, the side of the first diaphragm away from the first sound transmission channel is connected to the second sound transmission channel through the plurality of first air holes, and the side of the second diaphragm away from the first sound transmission channel is connected to the second sound transmission channel through the plurality of second air holes.

[0019] In some embodiments, the sound-emitting part further includes a mounting bracket, and the first acoustic driver and the second acoustic driver are mounted on the mounting bracket together.

[0020] In some embodiments, a protrusion is provided on the mounting bracket at a position corresponding to the sound outlet hole, and the protrusion abuts against the inner wall of the shell.

[0021] In some embodiments, the protrusion is provided with a through hole, a first cross section of the through hole is flush with an end surface of the first basin frame, and a second cross section of the through hole is flush with an end surface of the second basin frame.

[0022] In some embodiments, the mounting bracket includes the protrusion and a ring-shaped portion connected to the protrusion, and there is only one positioning structure on the ring-shaped portion. The positioning structure is configured to position the first basin rack and the second basin rack with the mounting bracket, and the positioning structure is a combination of a positioning protrusion and a positioning groove.

[0023] In some embodiments, the maximum axial distance between the structure composed of the first sound driver, the second sound driver and the mounting bracket is a first dimension, and the maximum radial distance between the structure composed of the first sound driver, the second sound driver and the mounting bracket is a second dimension, and the ratio of the first dimension to the second dimension is in the range of 0.85 to 1.15.

[0024] In some embodiments, the shell is provided with a pressure relief hole in acoustic communication with the second sound transmission channel.

[0025] In some embodiments, a plurality of first solder pads are provided on the end surface of the first basin facing away from the first diaphragm, the minimum distance between at least some of the first solder pads and the pressure relief hole is a first minimum distance, the minimum distance between at least some of the air holes and the pressure relief hole is a second minimum distance, and the first minimum distance is greater than the second minimum distance; a plurality of second solder pads are provided on the end surface of the second basin facing away from the second diaphragm, the minimum distance between at least some of the second solder pads and the pressure relief hole is a third minimum distance, the maximum distance between at least some of the second air holes and the pressure relief hole is a fourth minimum distance, and the third minimum distance is greater than the fourth minimum distance.

[0026] In some embodiments, the ear hook has a first symmetry plane, and the sound outlet hole, the first sound transmission channel, and the pressure relief hole are all symmetrical relative to the first symmetry plane.

[0027] In some embodiments, when the ear clip earphone is worn, the pressure relief hole and the sound outlet hole are acoustically isolated by the inner wall of the cavum concha.

[0028] In some embodiments, the pressure relief hole includes a first end, a second end, and a connecting section connecting the first end and the second end. The first end, the second end, and the connecting section are arranged along the length direction of the pressure relief hole, and the minimum width of the first end and the second end is greater than the maximum width of the connecting section.

[0029] In some embodiments, a first step structure and a second step structure are provided on the inner side of the shell, and the first step structure abuts against the first magnetic conductive cover or the first basin frame of the first acoustic driver; the second step structure abuts against the second magnetic conductive cover or the second basin frame of the second acoustic driver.

[0030] In some embodiments, the first step structure includes a first stop portion and a second stop portion, the first stop portion abuts against the end surface of the first magnetic conductive cover facing away from the first diaphragm, and the second stop portion abuts against the outer wall of the first magnetic conductive cover; the second step structure includes a third stop portion and a fourth stop portion, the third stop portion abuts against the end surface of the second magnetic conductive cover facing away from the second diaphragm, and the fourth stop portion abuts against the outer wall of the second magnetic conductive cover.

[0031] In some embodiments, the first basin frame, the second basin frame and the mounting bracket are filled with glue to seal.

[0032] In some embodiments, the resonant frequency of the first diaphragm and the resonant frequency of the second diaphragm are both lower than 300 Hz, and the difference between the resonant frequency of the first diaphragm and the resonant frequency of the second diaphragm is less than 50 Hz.

[0033] In some embodiments, the first sound driver also includes a first coil arranged in the first basin, the first coil is arranged around the side wall of the first magnet, and one end of the first coil is connected to the first diaphragm; the second sound driver also includes a second coil arranged in the second basin, the second coil is arranged around the side wall of the second magnet, and one end of the second coil is connected to the second diaphragm; the ear hook has a first symmetry plane, the first basin is the same as the second basin and is symmetrical relative to the first symmetry plane, the first magnetic conductive cover is the same as the second magnetic conductive cover and is symmetrical relative to the first symmetry plane, and the first coil is the same as the second coil and is symmetrical relative to the first symmetry plane.

[0034] In some embodiments, the shell includes: a first hard shell; a second hard shell, configured to be disposed toward the wearer's cavum concha when worn; and a flexible body, configured to contact the wearer's cavum concha when worn; the first hard shell and the second hard shell enclose the accommodating cavity, and the flexible body covers the outer wall of the second hard shell.

[0035] In some embodiments, the plane where the outermost loop line of the end surface of the flexible body is located is a first reference plane, and the midpoint of the line connecting the center of the first diaphragm and the center of the second diaphragm is located outside the first reference plane; or the plane where the outermost loop line of the end surface of the second hard shell is located is a second reference plane, and the midpoint of the line connecting the center of the first diaphragm and the center of the second diaphragm is located outside the second reference plane.

[0036] In some embodiments, the ear hook has a first symmetry plane, the projection of the midpoint of the line connecting the center of the first diaphragm and the center of the second diaphragm on the first symmetry plane is a first projection point, the intersection of the first reference plane and the first symmetry plane is a first intersection line, and the distance between the first projection point and the first intersection line is in the range of 0.4 mm to 4 mm.

[0037] In some embodiments, the sound outlet is located on the second hard shell and the flexible body.

[0038] In some embodiments, the projection of the inner wall of the accommodating cavity on the first symmetry plane is a first projection, the projection of the first reference plane on the first symmetry plane is a second projection, the first projection and the second projection have a first intersection and a second intersection, and the distance between the first intersection and the second intersection is the intersection distance; the first projection includes a first arc segment and a second arc segment, and the ratios of the first arc segment and the second arc segment to the intersection distance are both between 1.4 and 1.7.

[0039] In some embodiments, the ear-clip earphones also include a microphone assembly, which is disposed in the ear hook and forms a third sound transmission channel; a sound inlet hole is provided on the side of the ear hook close to the sound-emitting part, and the sound inlet hole is acoustically connected to the third sound transmission channel; the ear hook has a first symmetry plane, and the sound inlet hole is symmetrical relative to the first symmetry plane. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present application will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, like numbers represent like structures, wherein:

[0041] FIG1 is a schematic diagram of an exemplary wearing method of an ear clip-on headset according to some embodiments of this specification;

[0042] FIG2 is a schematic structural diagram of an ear-clip earphone according to some embodiments of this specification;

[0043] FIG3 is a schematic cross-sectional view of a sound-emitting portion perpendicular to the length direction of an ear hook according to some embodiments of the present disclosure;

[0044] FIG4 is a schematic cross-sectional view of an ear clip-on headset along a first symmetry plane according to some embodiments of this specification;

[0045] FIG5 is a schematic cross-sectional view of an ear clip-on headset in a horizontal plane according to some embodiments of this specification;

[0046] FIG6 is a graph showing sound pressure received by a test microphone when a sound emitting portion or a sound emitting component is located at different positions of the test microphone according to some embodiments of this specification;

[0047] FIG7A is a schematic diagram of the arrangement positions of sound outlet holes according to some embodiments of this specification;

[0048] FIG7B is a schematic diagram of an ear-clip earphone in a wearing state according to some embodiments of this specification;

[0049] FIG8 is a schematic diagram of wearing states at different β angles according to some embodiments of this specification;

[0050] FIG9 is a schematic cross-sectional view of an ear-clip earphone along a first symmetry plane according to other embodiments of the present disclosure;

[0051] FIG10 is a schematic cross-sectional view of a sound-emitting portion on a first symmetry plane according to other embodiments of the present specification;

[0052] FIG11 is a schematic cross-sectional view of a sound-emitting portion on a first symmetry plane according to yet other embodiments of the present specification;

[0053] FIG12 is a schematic cross-sectional view of two sound drivers in the axial and radial planes of the first magnetic conductive cover according to some embodiments of the present specification;

[0054] 13 is a top view of a first acoustic driver, a second acoustic driver, and a mounting bracket connected according to some embodiments of the present specification;

[0055] 14 is a front view of a first acoustic driver, a second acoustic driver, and a mounting bracket connected according to some embodiments of the present specification;

[0056] FIG15 is a schematic structural diagram of a first sound driver, a second sound driver, and a mounting bracket when connected according to other embodiments of the present specification;

[0057] FIG16 is a schematic diagram of an assembly of a first acoustic driver, a second acoustic driver, and a mounting bracket according to some embodiments of the present specification;

[0058] FIG17 is a schematic cross-sectional view of another sound-emitting portion in the axial and radial planes according to some embodiments of this specification;

[0059] FIG18 is a schematic structural diagram of an ear-clip earphone according to some embodiments of this specification;

[0060] FIG19 is a schematic cross-sectional view of a sound-emitting portion on a plane parallel to the first symmetry plane according to some embodiments of the present specification. DETAILED DESCRIPTION

[0061] To more clearly illustrate the technical solutions of the embodiments of this application, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are merely examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without inventive effort. Unless otherwise apparent from the context or otherwise noted, the same reference numerals in the figures represent the same structure or operation.

[0062] It should be understood that the terms "system," "device," "unit," and / or "module" used herein are a method for distinguishing different components, elements, parts, portions, or assemblies at different levels. However, if other terms can achieve the same purpose, the terms may be replaced by other expressions.

[0063] As used in this application and the claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not intended to refer to the singular but may include the plural. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements.

[0064] In the description of this specification, it should be understood that the terms "first," "second," "third," "fourth," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of such features. In the description of this specification, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0065] In this specification, unless otherwise specified or limited, terms such as "connected" and "fixed" should be interpreted broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; and can refer to internal communication between two components or an interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this specification based on the specific circumstances.

[0066] FIG1 is an exemplary wearing diagram of an ear-clip earphone according to some embodiments of the present specification. FIG2 is a structural diagram of an ear-clip earphone according to some embodiments of the present specification. In some embodiments, the ear-clip earphone 200 may include, but is not limited to, an air conduction earphone, a bone air conduction earphone, and an earphone combining air conduction and bone conduction. As shown in FIG1-2 , the ear-clip earphone 200 may include a sound-emitting portion 21 (or a sound-emitting component), an abutting portion 26, and an ear hook 27 connecting the sound-emitting portion 21 and the abutting portion 26. The ear-clip earphone 200 can be clamped on the wearer's ear 100 by the cooperation of the ear hook 27, the sound-emitting portion 21, and the abutting portion 26.

[0067] In some embodiments, when the ear clip-on earphone 200 is worn, the sound-producing portion 21 is located within the wearer's cavum concha 102 and abuts against the inner wall of the cavum concha 102. The abutment portion 26 abuts the back of the wearer's ear, for example, against the back of the cavum concha 102. The ear hook 27 connects the abutment portion 26 and the sound-producing portion 21 at both ends, respectively. The middle region of the ear hook 27 forms an extended section with a certain curvature, allowing the ear hook 27 to pass around the wearer's antihelix 104 and helix 106 when worn. The ear hook 27 can be elastic, meaning that when the sound-producing portion 21 is away from the abutment portion 26, the ear hook 27 can provide an elastic force that urges the sound-producing portion 21 toward the abutment portion 26. When worn, the elastic force of the ear hook 27 can be converted into a clamping force that clamps the sound-producing portion 21 and the abutment portion 26 against the front and back sides of the cavum concha 102, ensuring wearer stability.

[0068] In some embodiments, to match the shape of the cavum concha 102, the sound-producing portion 21 needs to have a shape similar to that of the cavum concha 102, such as a sphere, a spherical shape, or a spindle shape. This ensures that the sound-producing portion 21 fully contacts the inner wall of the cavum concha 102 and is clamped to the front and back sides of the cavum concha 102 by the abutment portion 26. Limited by the spatial dimensions of the cavum concha 102, the housing of the sound-producing portion 21 is relatively small, limiting the size of the acoustic driver housed therein and resulting in low sound production efficiency of the sound-producing portion 21.

[0069] On this basis, some embodiments of this specification propose an earclip headphone having two acoustic drivers disposed within the sound-producing housing, with a first sound transmission channel formed between the diaphragms of the two acoustic drivers. By providing a sound outlet in the sound-producing housing that is acoustically connected to the first sound transmission channel, the sound produced by the two acoustic drivers can be simultaneously output, thereby increasing the user's listening volume. Furthermore, by optimizing the structure and arrangement of the two acoustic drivers, the overall structure formed by the two acoustic drivers can be better adapted to the internal space of the sound-producing housing, thereby fully utilizing the limited space of the sound-producing housing and further improving the sound emission efficiency of the sound-producing housing. The earclip headphone proposed in this specification, when the sound-producing housing extends into the concha cavity, can fully and effectively utilize the internal space of the sound-producing housing and improve the overall sound emission efficiency of the sound-producing housing, significantly enhancing the wearing comfort and sound quality of the earclip headphone.

[0070] Figure 3 is a schematic cross-sectional view of the sound-emitting portion according to some embodiments of the present specification, taken perpendicular to the length direction of the earhook. Figure 4 is a schematic cross-sectional view of the ear-clip earphone according to some embodiments of the present specification, taken on a first symmetry plane. Figure 5 is a schematic cross-sectional view of the ear-clip earphone according to some embodiments of the present specification, taken on a horizontal plane. As shown in Figures 1 to 5 , the earhook 27 has a first symmetry plane A1. The first symmetry plane A1 is a plane that divides the earhook 27 into two symmetrical parts along the length direction of the earhook 27. The first symmetry plane A1 is parallel or substantially parallel to the length direction of the earhook 27. Therefore, the first symmetry plane A1 can also be referred to as the earhook length direction symmetry plane. The length direction of the earhook 27 refers to the direction extending from the end of the earhook 27 connected to the abutting portion 26 to the end of the earhook 27 connected to the sound-emitting portion 21. The length direction of the earhook 27 can be represented by the arrow Z in Figure 5 .

[0071] In some embodiments, the ear hook 27 may include but is not limited to a hook structure, an elastic band, a metal wire or a metal sheet, so that the ear clip-on earphone 200 can be better fixed on the wearer to prevent it from falling off when worn.

[0072] In some embodiments, as shown in Figures 1-4 , the abutment portion 26 abuts behind the wearer's ear to cooperate with the sound-emitting portion 21 to form a clamping structure to clamp the ear 100. In some embodiments, the abutment portion 26 may have a second shell 261, and the abutment portion 26 is connected to the ear hook 27 through the second shell 261. The second shell 261 may form a storage space. In some embodiments, the storage space formed by the second shell 261 can serve as a battery compartment for accommodating batteries and / or other components (such as a circuit board). In some embodiments, the battery can provide power to the ear clip-on headphones 200. For example, the battery can be electrically connected to the sound-emitting portion 21 to provide power to the sound-emitting portion 21. In some embodiments, the circuit board can be electrically connected to the sound-emitting portion 21 (for example, via a wire or a flexible circuit board) so that the circuit board can control the sound emitted by the sound-emitting portion 21. In some embodiments, the circuit board and battery can both be arranged in the storage space formed by the second shell 261. In some embodiments, the circuit board and battery may also be disposed within the accommodation space formed by the second housing 261 and the housing 210 of the sound-emitting portion 21, respectively. The circuit board and battery may be electrically connected to each other via corresponding conductors and further electrically connected to the sound-emitting portion via conductors. In some embodiments, the circuit board and battery may also be both disposed within the housing 210 of the sound-emitting portion 21.

[0073] The sound-generating unit 21 is the sound-generating device of the earphone 200. As shown in FIG3 , the sound-generating unit 21 may include a housing 210, a first sound driver 220, a second sound driver 230, and a sound outlet 240. The housing 210 has a housing 211. The first sound driver 220 and the second sound driver 230 are housed together within the housing 211. The sound outlet 240 is located on the housing 210. The sound outlet 240 is used to output the sound generated by the first sound driver 220 and the second sound driver 230.

[0074] In some embodiments, the housing 210 can be integrally formed. In some embodiments, the housing 210 can be composed of multiple parts. For example, the housing 210 can include a first hard shell 214 and a second hard shell 215, and the first hard shell 214 and the second hard shell 215 enclose the housing 210 with the accommodating cavity 211. One of the two hard shells (for example, the second hard shell 215) faces the wearer's cavum concha and contacts the inner wall of the cavum concha. The other hard shell is connected to the ear hook 27. In some embodiments, the housing 210 can also include a flexible body 216. The outer surface of one of the two hard shells that contacts the inner wall of the wearer's cavum concha (such as the second hard shell 215) can be covered with a flexible body 216.

[0075] An acoustic driver refers to a device that can receive electrical signals and convert them into acoustic signals for output. For example, a speaker, a transducer, etc. The acoustic driver may include a diaphragm and a magnetic circuit assembly. The magnetic circuit assembly is used to generate a magnetic field. In some embodiments, the magnetic circuit assembly may include a magnet, a magnetic shield, a magnetic plate, and a coil. The diaphragm can vibrate under the action of the magnetic field and the coil, driving the air around the diaphragm to vibrate. The chamber inside the housing 210 (i.e., the accommodating chamber 211) can be divided by the diaphragm into at least a front chamber and a rear chamber. The front chamber refers to the acoustic cavity formed on the side of the diaphragm facing away from the magnetic circuit assembly. The rear chamber refers to the acoustic cavity formed on the side of the diaphragm closer to the magnetic circuit assembly. The sound generated on the side of the diaphragm facing away from the magnetic circuit assembly is discharged from the housing 210 through the sound outlet 240 coupled to the front chamber. The sound generated on the side of the diaphragm facing the magnetic circuit assembly is discharged from the housing 210 through a pressure relief hole (e.g., the pressure relief hole 217 shown in Figure 18) that is acoustically coupled to the rear chamber.

[0076] In this embodiment, by disposing two sound drivers inside the housing 210 of the sound-emitting portion 21, the sounds generated by the two sound drivers can be simultaneously output, thereby increasing the listening volume for the wearer. FIG6 exemplarily illustrates a graph of sound pressure curves received by a test microphone when the sound-emitting portion (e.g., the sound-emitting portion 21 in FIG1 ) and the sound-emitting assembly are located at different positions within the test microphone. The test microphone is capable of receiving external sound signals. As shown in FIG6 , the graph shows a sound pressure curve 410 received by the test microphone when the sound-emitting portion is located directly to the left of the test microphone, a sound pressure curve 420 received by the test microphone when the sound-emitting portion is located directly to the right of the test microphone, a sound pressure curve 430 received when the sound-emitting assembly is located above the left of the test microphone, a sound pressure curve 440 received when the sound-emitting assembly is located below the left of the test microphone, a sound pressure curve 450 received by the test microphone when the sound-emitting assembly is located above the right of the test microphone, and a sound pressure curve 460 received by the test microphone when the sound-emitting assembly is located below the right of the test microphone. Among them, the top and bottom in this embodiment correspond to the opposite sides of the test microphone, respectively, and the left and right also correspond to the opposite sides of the test microphone, respectively, and the direction from top to bottom is different from the direction from left to right. Sound pressure curve 410 and sound pressure curve 420 correspond to the sound-emitting part with a double diaphragm structure in the embodiment of this specification (for example, the sound-emitting part 21 in Figure 1), and the two diaphragms are connected in parallel with the same voltage. Sound pressure curves 430 to 460 correspond to a sound-emitting component with a single diaphragm structure. Assuming that the sound pressure at the sound outlet of the sound-emitting component with a single diaphragm is P, the sound pressure at the sound outlet of the sound-emitting part of the double diaphragms with the same voltage and in parallel is 2P1. According to the sound pressure level formula: SPL = 20*log10(P / Pref) (1)

[0077] Where Pref is the reference sound pressure, the difference between the sound pressure level of the sound-emitting component with a single diaphragm structure and the sound pressure level of the sound-emitting component with a dual diaphragm structure is: Δ=20*log10(2P / P)=20*log10(2)≈6dB (2)

[0078] That is, by setting up a dual diaphragm structure, the sound pressure level of the sound-emitting part can be effectively increased, thereby increasing the wearer's listening volume.

[0079] As shown in FIG3 , the first acoustic driver 220 may include a first diaphragm 221 and a first magnetic circuit assembly disposed on one side of the first diaphragm 221 in the vibration direction (e.g., a first magnetic conductive plate 225, a first magnet 222, and a first magnetic conductive cover 223, sequentially located away from the first diaphragm 221). The second acoustic driver 230 may include a second diaphragm 231 and a second magnetic circuit assembly disposed on one side of the second diaphragm 231 in the vibration direction (e.g., a second magnetic conductive plate 235, a second magnet 232, and a second magnetic conductive cover 233, sequentially located away from the second diaphragm 231). A first acoustic channel 212 is formed between the first diaphragm 221 and the second diaphragm 231. The first acoustic channel 212 and the first magnetic circuit assembly are located on either side of the first diaphragm 221 in the vibration direction, and the first acoustic channel 212 is equivalent to the front chamber of the first acoustic driver 220. The second acoustic channel 213 and the second magnetic circuit assembly are located on either side of the second diaphragm 231 in the vibration direction, and the first acoustic channel 212 is also equivalent to the front chamber of the second acoustic driver 230. The first sound transmission channel 212 serves as a front cavity for both the first sound driver 220 and the second sound driver 230. Therefore, the first sound transmission channel 212 is a shared front cavity for the first sound driver 220 and the second sound driver 230. The vibration direction of the diaphragm can be perpendicular to the plane of the diaphragm, as indicated by the arrow X in FIG3 .

[0080] When the first acoustic driver 220 and the second acoustic driver 230 share a front cavity, the sound waves in the front cavities of the two acoustic drivers can be directed out of the housing 210 through the same sound outlet 240, thereby simplifying the overall structure of the sound-emitting portion 21 and reducing the manufacturing cost of the sound-emitting portion 21. In other words, by configuring the first acoustic driver 220 and the second acoustic driver 230 to share a front cavity, the number of openings in the housing 210 can be reduced. In addition, the dual-diaphragm structure, when working in conjunction, has a greater impact on changes in sound pressure in the first sound transmission channel 212. When the cross-sectional area of ​​the sound outlet 240 remains unchanged, the two acoustic drivers working in conjunction can increase the volume of the sound emitted from the sound outlet 240, thereby improving the sound quality.

[0081] In some alternative embodiments, the front cavity of the first sound driver 220 and the front cavity of the second sound driver 230 may be independent of each other and acoustically connected to different sound outlets, respectively.

[0082] In some alternative embodiments, the rear cavity of the first acoustic driver 220 and the rear cavity of the second acoustic driver 230 can be independent of each other and acoustically connected to different pressure relief holes (for example, the number of pressure relief holes 217 shown in FIG18 can be two, and the two pressure relief holes 217 are connected to the rear cavity of the first acoustic driver 220 and the rear cavity of the second acoustic driver 230, respectively). In some alternative embodiments, the rear cavity of the first acoustic driver 220 and the rear cavity of the second acoustic driver 230 can be connected to each other and radiate sound outward through the same pressure relief hole (for example, the pressure relief hole 217 in FIG18). That is, the first acoustic driver 220 and the second acoustic driver 230 share a rear cavity.

[0083] In some embodiments, as shown in Figures 1-5 , the ear clip-on headphones 200 may further include a microphone assembly (not shown). The microphone assembly is configured to convert received sound signals into electrical signals. In some embodiments, based on the transduction principle, the microphone assembly may include a condenser microphone, a piezoelectric microphone, a piezoresistive microphone, etc. In some embodiments, based on the sound collection method, the microphone assembly may include an air conduction microphone or a combination of air conduction and bone conduction microphones. In some embodiments, the microphone assembly may be disposed within the ear hook 27, and the microphone assembly may form a third sound transmission channel (not shown). A sound inlet (e.g., sound inlet 280 in Figure 9 ) is provided on a side of the ear hook 27 near the sound-emitting portion 21. The sound inlet is acoustically connected to the third sound transmission channel. The sound inlet may be symmetrical with respect to the first symmetry plane A1. In this embodiment, sound signals (e.g., signals generated when the wearer speaks) can be transmitted through the sound inlet to the third sound transmission channel, where they are received by the microphone assembly and then processed by the microphone assembly to produce a corresponding electrical signal. By arranging the sound inlet holes symmetrically with respect to the first symmetry plane A1, the effect of the microphone assembly receiving sound signals will not be significantly affected regardless of whether the ear clip earphone 200 is worn on the left or right ear of the wearer.

[0084] In some embodiments, the first diaphragm 221 and the second diaphragm 231 can be identical or similar. As an example only, in conjunction with Figures 3-6 , it can be seen that the sound pressure curves 410 and 420 corresponding to the sound-emitting portion having a dual-diaphragm structure both produce a peak in the frequency range of 200Hz to 300Hz. This peak is the frequency at which the corresponding sound-emitting portion produces a resonance peak, which is equivalent to the resonance frequency of the first diaphragm 221 and the resonance frequency of the second diaphragm 231 being both lower than 300Hz, and the difference between the resonance frequency of the first diaphragm 221 and the resonance frequency of the second diaphragm 231 being less than 50Hz. The resonance frequency refers to the first resonance peak that appears in order from low to high frequency when performing an electroacoustic sweep test on the sound-emitting portion (for example, a structure consisting of a sound driver, a housing, and an internal cavity of the housing). The location of this resonance peak corresponds to the location where the impedance curve of the sound-emitting portion suddenly increases. The resonance frequency of the diaphragm refers to the resonance frequency exhibited after the diaphragm is assembled into a sound driver. In the embodiment of this specification, the resonance peak frequencies of the two diaphragms of the sound-emitting portion 21 are both below 300 Hz. For example, the resonance frequencies of both diaphragms are between 200 Hz and 300 Hz, which can better represent the low-frequency portion of the sound signal, thereby providing a better musical effect. In addition, if the first diaphragm 221 and the second diaphragm 231 are identical, there is no need to manufacture the first diaphragm 221 and the second diaphragm 231 separately, which can reduce the number of manufacturing materials, reduce costs, and reduce production difficulty.

[0085] In some embodiments, as shown in Figures 3-5 , the first diaphragm 221 and the second diaphragm 231 are respectively located on opposite sides of a first symmetry plane A1, and the first diaphragm 221 and the second diaphragm 231 are symmetrical with respect to the first symmetry plane A1. The two opposite sides of the first symmetry plane A1 refer to the two opposite sides in a direction perpendicular to the first symmetry plane A1. Symmetrical with respect to the first symmetry plane A1 means that the two diaphragms are mirror-symmetrical with respect to the first symmetry plane A1.

[0086] In some cases, when the first diaphragm 221 and the second diaphragm 231 are identical and are mirror-symmetrical about the first symmetry plane A1, the cost and production difficulty can be further reduced.

[0087] Furthermore, when the first diaphragm 221 and the second diaphragm 231 are mirror-symmetrical about the first symmetry plane A1, the first magnetic circuit component (for example, the first magnet 222, the first magnetic shield 223, etc.) and the second magnetic circuit component (for example, the second magnet 232, the second magnetic shield 233, etc.) can be arranged to be mirror-symmetrical with respect to the first symmetry plane A1, thereby making the first sound driver 220 and the second sound driver 230 mirror-symmetrical about the first symmetry plane A1, which can reduce the types of materials used to manufacture the sound-emitting portion 21 and further reduce costs and production difficulties. At the same time, when the first sound driver 220 and the second sound driver 230 are mirror-symmetrical about the first symmetry plane A1, the overall structure formed by the first sound driver 220 and the second sound driver 230 can be made closer to a sphere, a spheroid or a spindle, and further adapt to the shape of the accommodating cavity 211, so as to achieve the purpose of fully utilizing the space of the accommodating cavity 211.

[0088] In some embodiments, the first diaphragm 221 and the second diaphragm 231 may be approximately symmetrical (i.e., not completely symmetrical) relative to the first symmetry plane A1. For example only, the angle between the plane where the first diaphragm 221 resides and the first symmetry plane A1 is a first angle, and the angle between the plane where the second diaphragm 231 resides and the first symmetry plane A1 is a second angle. When the difference between the first angle and the second angle is between 0 and 5 degrees, the first diaphragm 221 and the second diaphragm 231 can be considered approximately symmetrical relative to the first symmetry plane A1.

[0089] In some alternative embodiments, the first diaphragm 221 and the second diaphragm 231 may be symmetrical with respect to a plane different from the first plane of symmetry A1. By way of example only, the first diaphragm 221 and the second diaphragm 231 may be located on either side of a first parallel plane of symmetry and symmetrical with respect to the first parallel plane of symmetry. The first parallel plane of symmetry may be parallel to the first plane of symmetry A1. However, the distance between the first diaphragm 221 and the first plane of symmetry A1 is different from the distance between the second diaphragm 231 and the first plane of symmetry A1.

[0090] In some embodiments, the angle between the central axis of the sound hole 240 and the central axis of the first sound transmission channel 212 can be made smaller than a certain value, so that the sound waves in the first sound transmission channel 212 can be more smoothly discharged through the sound hole 240, thereby improving the sound quality.

[0091] In some embodiments, the angle between the central axis of the sound outlet 240 and the central axis of the first sound transmission channel 212 may be less than 30 degrees. In some embodiments, the angle between the central axis of the sound outlet 240 and the central axis of the first sound transmission channel 212 may be less than 15 degrees. In some embodiments, the angle between the central axis of the sound outlet 240 and the central axis of the first sound transmission channel 212 may be less than 5 degrees. In some embodiments, the central axis of the sound outlet 240 may be parallel to the central axis of the first sound transmission channel 212. By way of example only, the central axis of the sound outlet 240 is the first central axis. The central axis of the first sound transmission channel 212 is the second central axis. The distance between the first central axis and the second central axis is the first distance. The distance between the surface of the first diaphragm 221 and the surface of the second diaphragm 231 is the second distance. The ratio of the first distance to the second distance is less than a predetermined distance ratio. Examples of predetermined distance ratios may include 20%, 10%, 5%, etc.

[0092] In some embodiments, the central axis of the sound hole 240 coincides with the central axis of the first sound transmission channel 212. The cross-sectional shape of the sound hole 240 perpendicular to its central axis is the same as the cross-sectional shape of the first sound transmission channel 212 perpendicular to its central axis. The entrance of the sound hole 240 is aligned with the opening of the first sound transmission channel 212. Alignment means that the entrance edge of the sound hole 240 is flush with the opening edge of the first sound transmission channel 212.

[0093] In some embodiments, as shown in FIG. 1 to FIG. 5 , the sound outlet 240 may be provided on a side of the housing 210 away from the ear hook 27 , so that when worn, the sound outlet 240 may face the wearer's ear canal.

[0094] In some embodiments, the first symmetry plane A1 may pass through the sound outlet 240. In some embodiments, the sound outlet 240 may be centrally located or offset on the housing 210. For example, the sound outlet 240 may be in the shape of an elongated strip. Along the length of the sound outlet 240, the first symmetry plane A1 may divide the sound outlet 240 into two symmetrical portions. For another example, when the sound outlet 240 is offset on the housing 210, the outer end surface of the sound outlet 240 is asymmetrical with respect to the first symmetry plane A1.

[0095] In some embodiments, the inner end surface of the sound outlet 240 is flush with the inner wall surface of the shell 210, and the outer end surface of the sound outlet 240 is flush with the outer wall surface of the shell 210. In some embodiments, the outer end surface of the sound outlet 240 may be projected onto the first symmetry plane A1 to form an arc segment. The projection of the shell 210 onto the first symmetry plane A1 has an arc-shaped outer contour. At least part of the arc-shaped outer contour overlaps with the arc segment. For ease of description, the arc segment formed by the projection of the outer end surface of the sound outlet 240 onto the first symmetry plane A1 will be simply referred to as the arc segment of the sound outlet 240, and the arc-shaped outer contour of the projection of the shell 210 onto the first symmetry plane A1 will be simply referred to as the arc-shaped outer contour of the shell 210. In some embodiments, the sound-emitting portion 21 (or shell 210) as a whole may be spherical, and the projection of the shell 210 onto the first symmetry plane A1 may have an arc-shaped outer contour. Because the sound outlet 240 is formed in the housing 210 of the sound-emitting portion 21, the outer end surface of the sound outlet 240 is an arc-shaped structure. Based on this, it can be seen that the projection of the outer end surface of the sound outlet 240 onto the first symmetry plane A1 forms an arc segment. Furthermore, when the outer end surface of the sound outlet 240 is symmetrical about the first symmetry plane A1, the arc segment of the sound outlet 240 overlaps at least partially with the arc-shaped outer contour of the housing 210.

[0096] By designing the sound outlet 240 as an elongated strip, with the projection of the long side of the strip onto the first plane of symmetry A1 forming an arc segment with a certain arc length, the ear clip-on earphone 200 can adapt to people with different ear sizes and shapes. Specifically, as shown in Figures 1, 3, and 5, when the sound-emitting portion 21 is inserted into the cavum concha 102 of different depths or sizes, different areas of the sound-emitting portion 21 may be blocked to varying degrees by the inner wall of the cavum concha 102, or the area of ​​the housing 210 of the sound-emitting portion 21 facing the ear canal may experience changes in sound. The elongated sound outlet 240 with the first plane of symmetry A1 as the symmetry plane ensures that in most scenarios, a certain area of ​​the sound outlet 240 always faces the ear canal, thereby improving the sound quality of the earphone. In addition, by setting at least a portion of the arc-shaped outer contour of the shell 210 to overlap with the arc-shaped segment of the sound outlet 240, it can be ensured that the outer end face of the sound outlet 240 is symmetrical about the first symmetry plane A1, thereby ensuring that a part of the area of ​​the sound outlet 240 can be blocked by the wall of the concha cavity when worn, so that the sound field of the sound derived from the sound outlet 240 is a reflection field, forming an emission enhancement, thereby increasing the volume heard by the wearer.

[0097] Figure 7A is a schematic diagram of the sound hole setting position according to some embodiments of this specification. Figure 7B is a schematic diagram of the wearing state of the ear clip earphone according to some embodiments of this specification. Figure 8 is a schematic diagram of the wearing state at different β angles according to some embodiments of this specification. In some embodiments, in combination with Figures 3 to 8, by changing the position of the sound hole 240 in the sound-emitting part 21, the output volume of the ear clip earphone 200 at the wearer's ear canal can be adjusted. Generally, the greater the output volume of the ear clip earphone 200 toward the ear canal, the louder the sound that the wearer can experience at the same output power, which can reduce the energy consumption of the ear clip earphone 200 and reduce sound leakage.

[0098] In some embodiments, as shown in conjunction with Figures 2-5, 7A, 7B, and 8, in order to change the position of the sound outlet 240 within the sound-emitting portion 21, the positions of the first diaphragm 221 and the second diaphragm 231 need to be adjusted. For example, the first diaphragm 221 and the second diaphragm 231 can be adjusted to be symmetrical relative to the second symmetry plane A2, wherein the first symmetry plane A1 and the second symmetry plane A2 form an inclination angle of less than 45 degrees. In this case, if the central axis of the sound outlet 240 coincides with the central axis of the first sound transmission channel 212, the central axis of the sound outlet 240 also forms an inclination angle of less than 45 degrees with the first symmetry plane A1, that is, the sound outlet 240 is offset relative to the first symmetry plane A1. With this design, even if gravity causes the ear hook 27 to tilt relative to the auricle during wear (i.e., as shown in Figure 7B, the middle region of the ear hook 27 slides toward the bottom of the auricle relative to the sound-emitting portion 21), the sound outlet 240 can still face the ear canal.

[0099] In other embodiments, as shown in Figures 2 to 5, 7A, 7B and 8, the sound outlet 240 is symmetrical with respect to a third symmetry plane (not shown in the figures), the third symmetry plane is perpendicular to the contact area between the sound outlet 240 and the inner wall of the cavum concha 102, and an inclination angle of less than 45 is formed between the first symmetry plane A1 and the third symmetry plane. The contact area refers to the contact portion between the outer end surface of the sound outlet 240 and the inner wall of the cavum concha 102. This embodiment describes the offset of the sound outlet 240 from another angle, aiming to illustrate that even if the ear hook 27 is tilted relative to the auricle during wearing due to gravity (that is, as shown in Figure 7B, the middle area of ​​the ear hook 27 slides toward the bottom of the auricle relative to the sound-emitting part 21), the sound outlet 240 can still face the ear canal.

[0100] In some embodiments, as shown in Figures 1, 3, and 8, the sound outlet 240 can be an elongated strip, with the length of the sound outlet 240 parallel to the first symmetry plane A1. The angle between the normal line from the sound-emitting portion 21 pointing outward to the sound outlet 240 (i.e., the central axis of the sound outlet 240) and the symmetry plane along the length of the earhook (i.e., the first symmetry plane A1) is defined as α, and the angle between the first symmetry plane A1 and the horizontal plane of the human body is defined as β. The horizontal plane of the human body refers to a plane that intersects an upright human body and is parallel to the ground. Figure 8 shows the angles between the first symmetry plane A1 and the horizontal plane of the human body in three different earphone placement scenarios: β1 = -20°, β2 = 0°, and β3 = 45°. When α = 0°, the first symmetry plane A1 passes through the central axis of the sound outlet 240. When β = 0°, the first symmetry plane A1 is parallel to the horizontal plane of the human body. If α is within the range of 15°-45°, the sound pressure level (SPL) of the frequency response curve of the ear clip-on earphone 200 is the highest, indicating the maximum output volume. When the ear-clip earphones 200 are worn, the angle β is usually between 0° and 30° due to the influence of gravity. Therefore, the sound outlet 240 is set to be α=15°-45° between the normal line of the sound outlet 240 and the first symmetry plane A1 when β=0° (that is, the first symmetry plane A1 is parallel to the horizontal plane of the human body). This can increase the listening volume when β is between 0° and 30°.

[0101] In some embodiments, when the wearer wears the ear-clip earphones 200, the sound outlet 240 can be completely located on the side of the first symmetry plane A1 closer to the wearer's earlobe, so as to further ensure that even if the ear-clip earphones 200 are tilted due to factors such as gravity when worn, the sound outlet 240 of the ear-clip earphones 200 can face the ear canal, thereby ensuring the listening effect and listening volume.

[0102] It should be noted that Figures 3-8 and their embodiments are merely illustrative of one exemplary structure of the sound-emitting portion 21 and are not intended to limit the specific structure of the sound-emitting portion 21. Once the basic principles of the sound-emitting portion 21 are understood, the structure of the sound-emitting portion 21 can be adjusted according to actual circumstances. Figures 9-11 illustrate exemplary arrangements of two sound-emitting portions within the housing. In some embodiments, as shown in Figures 9-10, the first diaphragm 221 and the second diaphragm 231 of the sound-emitting portion 21 can be symmetrical relative to the fourth plane of symmetry A4, with the fourth plane of symmetry A4 being perpendicular to the first plane of symmetry A1. In some embodiments, to change the position of the sound outlet 240 within the sound-emitting portion 21, the positions of the first diaphragm 221 and the second diaphragm 231 need to be adjusted. For example, as shown in Figure 11, the first diaphragm 221 and the second diaphragm 231 are adjusted to be symmetrical relative to the fifth plane of symmetry A5, where the fifth plane of symmetry A5 forms an inclination angle of less than 45 degrees with the fourth plane of symmetry A4, and the fifth plane of symmetry A5 is perpendicular to the first plane of symmetry A1. In some embodiments, when the first diaphragm 221 and the second diaphragm 231 are symmetrical with respect to the fourth plane of symmetry A4 or the fifth plane of symmetry A5, the central axis of the sound outlet 240 can coincide with the central axis of the first sound transmission channel 212, and the cross-sectional shape of the sound outlet 240 perpendicular to its central axis is identical to the cross-sectional shape of the first sound transmission channel 212 perpendicular to its central axis, and the entrance of the sound outlet 240 is aligned with the opening of the first sound transmission channel 212. In other embodiments, to ensure that the sound outlet 240 points toward the ear canal when the ear clip-on headphone 200 is tilted under the action of gravity, the sound outlet 240 can be positioned entirely on the side of the first plane of symmetry A1 closer to the wearer's earlobe when the wearer wears the ear clip-on headphone 200.

[0103] Figure 12 is a schematic cross-sectional view of two acoustic drivers according to some embodiments of the present disclosure, taken along axial and radial planes of a first magnetic shield. Figure 13 is a top view of the first and second acoustic drivers connected to a mounting bracket according to some embodiments of the present disclosure. As shown in conjunction with Figures 3-4 and 12-13, the first acoustic driver 220 includes a first magnet 222, a first magnetic shield 223, and a first frame 224 for supporting the first diaphragm 221, the first magnet 222, and the first magnetic shield 223. The first frame 224 includes a plurality of first ventilation holes 2241. The second acoustic driver 230 includes a second magnet 232, a second magnetic shield 233, and a second frame 234 for supporting the second diaphragm 231, the second magnet 232, and the second magnetic shield 233. The second frame 234 includes a plurality of second ventilation holes (not shown).

[0104] The first magnetic shield 223 has an open end and a closed end, with the open end of the first magnetic shield 223 facing the first diaphragm 221. The first magnet 222 is located within the first magnetic shield 223, and the end of the first magnet 222 facing away from the first diaphragm 221 is connected to the inner wall of the closed end of the first magnetic shield 223. The first frame 224 surrounds the first diaphragm 221, and the end of the first frame 224 facing away from the first diaphragm 221 defines a first mounting hole. The first magnetic shield 223 passes through the first mounting hole, and the outer wall of the first magnetic shield 223 is connected to the wall of the first mounting hole. The first frame 224, the first magnetic shield 223, and the first diaphragm 221 together form a cavity that serves as the back cavity of the first sound driver 220. Similarly, the second magnetic shield 233 has an open end and a closed end. The open end of the second magnetic shield 233 is positioned toward the second diaphragm 231. The second magnet 232 is located within the second magnetic shield 233, and the end of the second magnet 232 facing away from the second diaphragm 231 is connected to the inner wall of the closed end of the second magnetic shield 233. A second frame 234 surrounds the second diaphragm 231. A second mounting hole is defined at the end of the second frame 234 facing away from the second diaphragm 231. The second magnetic shield 233 passes through the second mounting hole, and the outer wall of the second magnetic shield 233 is connected to the wall of the second mounting hole. The second frame 234, the second magnetic shield 233, and the second diaphragm 231 collectively form a cavity that serves as the back cavity of the second sound driver 230.

[0105] Magnets (including first magnet 222 and second magnet 232) can be used to generate a magnetic field. When the magnetic field strength generated by the magnets changes, the force applied to the corresponding diaphragm changes, causing the corresponding diaphragm to vibrate. When the diaphragm vibrates, it drives the air in the first sound transmission channel 212 to vibrate, thereby generating sound waves. The magnetic shield can be used to suppress magnetic leakage from the magnetic circuit assembly of the sound driver. The basin frame is mainly used to support and secure the magnetic circuit assembly of the sound driver.

[0106] In some embodiments, the materials used to make the first magnetic conductive cover 223 and the second magnetic conductive cover 233 may include one or a combination of low-carbon steel, silicon steel sheet, silicon steel sheet, and ferrite. In some embodiments, the first magnet 222, the first magnetic conductive cover 223, and the first frame 224 may be the same as or similar to the second magnet 232, the second magnetic conductive cover 233, and the second frame 234.

[0107] In some embodiments, the first frame 224 and the first magnetic conductive cover 223 can be connected by bonding, snap-fit ​​connection, welding, riveting, etc. For example, in the embodiment shown in FIG12 , the connection between the first frame 224 and the first magnetic conductive cover 223 can be fixed by sealant. The second frame 234 and the second magnetic conductive cover 233 can also be connected by the same or similar connection method as the above embodiments.

[0108] It should be noted that the air holes are not limited to being set on the basin frame. As an example only, multiple first air holes 2241 can be set on the side wall of the first magnetic cover 223, and multiple first air holes 2241 can be set around the side wall of the first magnetic cover 223. Multiple second air holes can be set on the side wall of the second magnetic cover 233, and multiple second air holes can be set around the side wall of the second magnetic cover 233. In another example, multiple first air holes 2241 can be set at the closed end of the first magnetic cover 223, and multiple first air holes 2241 can be set along the edge of the closed end of the first magnetic cover 223. Multiple second air holes can be set at the closed end of the second magnetic cover 233, and multiple second air holes can be set along the edge of the closed end of the second magnetic cover 233.

[0109] In some embodiments, the first acoustic driver 220 further includes a first magnetic conductive plate 225 disposed within the first frame 224. The first magnetic conductive plate 225 is connected to the side of the first magnet 222 proximal to the first diaphragm 221 and is configured to adjust the distribution of the magnetic field generated by the first magnet 222. Similarly, the second acoustic driver 230 further includes a second magnetic conductive plate 235 disposed within the second frame 234. The second magnetic conductive plate 235 is connected to the side of the second magnet 232 proximal to the second diaphragm 231 and is configured to adjust the distribution of the magnetic field generated by the second magnet 232. In some embodiments, the first magnetic conductive plate 225 and the second magnetic conductive plate 235 can be identical or similar.

[0110] In some embodiments, the first sound driver 220 further includes a first coil 226 disposed within a first frame 224. The first coil 226 surrounds the sidewall of the first magnet 222, and one end of the first coil 226 is connected to the first diaphragm 221. When current is passed through the first coil 226 (for example, the first coil 226 is connected to a first soldering pad 2242 on the first frame 224, and current is passed through the first coil 226 via the first soldering pad 2242), the first coil 226 can vibrate under the influence of the magnetic field and drive the first diaphragm 221 to vibrate. Similarly, the second sound driver 230 further includes a second coil 236 disposed within a second frame 234. The second coil 236 surrounds the sidewall of the second magnet 232, and one end of the second coil 236 is connected to the second diaphragm 231. When current flows through the second coil 236 (for example, the second coil 236 is connected to a second solder pad (not shown) on the second frame 234, and current flows through the second solder pad), the second coil 236 can vibrate under the influence of the magnetic field and drive the second diaphragm 231 to vibrate. In some embodiments, the first coil 226 and the second coil 236 can be the same or similar.

[0111] In some embodiments, as shown in Figures 5 and 12 , the first frame 224 and the second frame 234 are identical and symmetrical relative to the first plane of symmetry A1. The first magnetic shield 223 and the second magnetic shield 233 are identical and symmetrical relative to the first plane of symmetry A1. The first coil 226 and the second coil 236 are identical and symmetrical relative to the first plane of symmetry A1. The two frames, magnetic shields, and coils of the sound-emitting portion 21 are identical and symmetrical, which can effectively improve the reusability of the various components of the sound-emitting portion 21, simplify the types of materials required to manufacture the sound-emitting portion 21, and reduce costs and production difficulties. In some embodiments, the first magnetic plate 225 and the second magnetic plate 235 are identical and symmetrical relative to the first plane of symmetry A1, and the first magnet 222 and the second magnet 232 are identical and symmetrical relative to the first plane of symmetry A1, thereby further improving the reusability of the various components of the sound-emitting portion 21, further simplifying the types of materials required to manufacture the sound-emitting portion 21, and further reducing costs and production difficulties.

[0112] In some embodiments, as shown in FIG12 , the sound-emitting portion 21 further includes a mounting bracket 250 , on which the first acoustic driver 220 and the second acoustic driver 230 are mounted. For example, a first bracket 224 is connected to the mounting bracket 250 . The first magnetic plate 225 , first magnet 222 , first magnetic shield 223 , and first diaphragm 221 of the first acoustic driver 220 are all connected to the mounting bracket 250 via the first bracket 224 . In other words, the first acoustic driver 220 is mounted on the mounting bracket 250 via the first bracket 224 . Similarly, the second bracket 234 is connected to the mounting bracket 250 . The second magnetic plate 235 , second magnet 232 , second magnetic shield 233 , and second diaphragm 231 of the second acoustic driver 230 are all connected to the mounting bracket 250 via the second bracket 234 . In other words, the second acoustic driver 230 is mounted on the mounting bracket 250 via the second bracket 234 .

[0113] In some cases, since the first sound driver 220 and the second sound driver 230 are both mounted on the same mounting bracket 250. For example, the mounting bracket 250 is mainly located between the first acoustic driver and the second acoustic driver, part of the structure on the mounting bracket 250 can be enclosed together with the first acoustic driver and the second acoustic driver to form a first transmission channel cavity (i.e., the first sound transmission channel 212). In this way, the overall structure of the sound-emitting part 21 can be simplified and the manufacturing cost of the sound-emitting part 21 can be reduced. Moreover, the shared cavity of the first sound driver 220 and the second sound driver 230 can be adjusted only by designing the mounting bracket 250, thereby avoiding the influence of the complex structure in the shell 210 on the acoustic effect of the shared cavity.

[0114] In some embodiments, sealant can be filled between the first basin frame 224, the second basin frame 234 and the mounting bracket 250 to ensure a tight connection between the mounting bracket 250 and the first basin frame 224 and the second basin frame 234, and the sealant can provide a certain elastic buffer space for the overall structure composed of the first sound driver 220, the second sound driver 230 and the mounting bracket 250 when it is assembled with the first hard shell 214, thereby reducing collision and extrusion between components.

[0115] In some embodiments, in combination with Figures 1-2 and 12, when the external shape of the shell 210 is a spindle, a sphere, a spherical shape, etc. that is compatible with the concha cavity, the overall structure composed of the first sound driver 220, the second sound driver 230 and the mounting bracket 250 can be designed to make it more compatible with the shape of the accommodating cavity 211 of the shell 210, thereby improving the utilization efficiency of the accommodating cavity 211 while ensuring the wearing comfort of the ear clip-type earphones 200, thereby improving the sound efficiency of the sound-emitting part 21.

[0116] In some embodiments, as shown in Figures 3 and 12 , the maximum axial distance between the structure formed by the first and second acoustic drivers 220, 230, and the mounting bracket 250 is a first dimension. The maximum axial distance between the structure formed by the first and second acoustic drivers 220, 230, and the mounting bracket 250 is the distance between the end surface of the first magnetic shield 223 facing away from the first diaphragm 221 and the end surface of the second magnetic shield 233 facing away from the second diaphragm 231. This distance can be represented by L1 in Figure 12 . The maximum radial distance between the structure formed by the first and second acoustic drivers 220, 230, and the mounting bracket 250 is a second dimension. In some embodiments, on the side facing away from the opening of the first sound transmission channel 212, the outer peripheral wall of the mounting bracket 250 is flush with the outer side walls of the first and second brackets 224, 234. On the side closer to the opening of the first sound transmission channel 212, the protrusion 251 of the mounting bracket 250 protrudes beyond the outer side walls of the first and second brackets 224, 234. Therefore, the maximum radial distance of the structure composed of the first sound driver 220, the second sound driver 230 and the mounting bracket 250 refers to the distance between the end face of the protrusion 251 of the mounting bracket 250 facing away from the first sound transmission channel 212 and the outer peripheral wall of the mounting bracket 250 facing away from the opening of the first sound transmission channel 212. This distance can be represented by L2 in Figure 12. In some embodiments, the ratio of the first dimension to the second dimension is in the range of 0.7 to 1.3. In some embodiments, the ratio of the first dimension to the second dimension is in the range of 0.85 to 1.15. In some embodiments, the ratio of the first dimension to the second dimension is in the range of 0.9 to 1.1. In some cases, by reducing the ratio of the first dimension to the second dimension, the overall structure composed of the first sound driver 220, the second sound driver 230 and the mounting bracket 250 can be further adapted to the shape of the accommodating cavity 211.

[0117] In some applications, the integrated structure consisting of the first acoustic driver 220, the second acoustic driver 230, and the mounting bracket 250 does not fit perfectly against the inner wall of the housing 210. In particular, a gap may exist between the outlet of the first acoustic channel 212 and the entrance of the sound outlet 240 (i.e., the end surface of the sound outlet 240 adjacent to the accommodating chamber 211). As sound enters the sound outlet 240 from the first acoustic channel 212, it may pass through this gap and enter other acoustic channels within the accommodating chamber 211, such as the rear chamber of the acoustic driver. This may prevent the corresponding diaphragm from vibrating effectively, thereby reducing the sound quality emitted from the sound outlet 240. In this embodiment, a protrusion 251 is provided on the mounting bracket 250 at a position corresponding to the sound outlet 240. The protrusion 251 can abut against the inner wall of the housing 210 to isolate the first acoustic channel 212 from other acoustic channels within the accommodating chamber 211, effectively preventing airflow leakage in the first acoustic channel 212 and ensuring the sound quality emitted from the sound outlet 240.

[0118] As shown in Figure 12, the mounting bracket 250 is an annular structure. Along the axis of the mounting bracket 250, the first diaphragm 221 and the second diaphragm 231 are disposed on either side of the mounting bracket 250, forming a first sound transmission channel 212 with the mounting bracket 250. The mounting bracket 250 serves as the sidewall of the first sound transmission channel 212. Furthermore, the first and second frames 224 and 234 are also disposed on either side of the mounting bracket 250, forming rear cavities for the first and second sound drivers 220 and 230, respectively. A protrusion 251 is provided on the mounting bracket 250 at a position corresponding to the sound outlet 240 (i.e., on the side of the mounting bracket 250 closest to the sound outlet 240). The protrusion 251 protrudes between the first and second frames 224 and 234 and abuts against the inner wall of the housing 210, isolating the first sound transmission channel 212 from other acoustic channels within the accommodating chamber 211 (e.g., the rear cavities of the sound drivers).

[0119] Figure 14 is a front view of the first sound driver, the second sound driver, and the mounting bracket when connected, according to some embodiments of this specification. Figure 15 is a schematic structural diagram of the first sound driver, the second sound driver, and the mounting bracket when connected, according to other embodiments of this specification. As shown in Figures 12-14 , the protrusion 251 of the mounting bracket 250 is provided with a plurality of through-holes 2511. Reinforcing ribs 2512 are provided between adjacent through-holes 2511. The first cross-section of the through-hole 2511 is flush with the end face of the first basin frame 224. The second cross-section of the through-hole 2511 is flush with the end face of the second basin frame 234. The first cross-section of the through-hole 2511 refers to the inner wall surface of the through-hole 2511 near the first basin frame 224. The second cross-section of the through-hole 2511 refers to the inner wall surface of the through-hole 2511 near the first basin frame 224. The end face of the first basin frame 224 refers to the end face of the first basin frame 224 near the second basin frame 234. The end surface of the second basin frame 234 refers to the end surface of the second basin frame 234 close to the first basin frame 224 .

[0120] For the convenience of description, the overall structure composed of the first sound driver 220, the second sound driver 230 and the mounting bracket 250 can be referred to as the first overall structure. If the first sound driver 220 and the second sound driver 230 are symmetrically arranged, for example, symmetrically relative to the first symmetry plane (for example, the first symmetry plane A1 in Figure 3), then after the first sound driver 220 is flipped 180 degrees relative to the first symmetry plane, the end face of the first basin 224 of the first sound driver 220 can be flush with the second cross-section of the through hole 2511. At this time, the overall structure composed of the two first sound drivers 220 and the mounting bracket 250 (which can be referred to as the second overall structure) has not changed compared to the first overall structure, so in the second overall structure, it is equivalent to the first sound driver 220 being reused as the second sound driver 230. Similarly, after the second sound driver 230 is flipped 180 degrees relative to the first symmetry plane, the end surface of the second basin frame 234 of the second sound driver 230 can be flush with the first cross-section of the through hole 2511. At this time, the overall structure composed of the two second sound drivers 230 and the mounting bracket 250 (which can be called the third overall structure) has not changed compared to the first overall structure. Therefore, in the third overall structure, it is equivalent to the second sound driver 230 being reused as the first sound driver 220. After such a setting, there is no need to produce the first sound driver 220 and the second sound driver 230 separately. The first sound driver 220 and the second sound driver 230 can be reused with each other, effectively reducing manufacturing costs.

[0121] Furthermore, in this embodiment, the presence of the reinforcing ribs 2512 effectively enhances the structural strength of the protrusion 251, preventing the mounting bracket 250 from being squeezed and deformed. In some embodiments, the reinforcing ribs 2512 are not a required structure for the protrusion 251. The purpose of providing the protrusion 251 is to isolate the first sound transmission channel 212 from other acoustic channels (e.g., the rear chamber of the sound driver) within the housing (e.g., the housing 211 in FIG. 3 ). Therefore, as long as the acoustic communication between the first sound transmission channel 212 and the sound outlet 240 is ensured, and the isolation between the first sound transmission channel 212 and other acoustic channels within the housing is achieved, it is sufficient. For example, in the embodiment shown in FIG. 15 , the protrusion 251 can be an open structure, with the sidewalls of the open structure abutting against the inner wall of the housing (e.g., the housing 210 in FIG. 3 ).

[0122] FIG16 is a schematic diagram illustrating the assembly of a first acoustic driver, a second acoustic driver, and a mounting bracket according to some embodiments of the present specification. As shown in FIG14-16 , the mounting bracket 250 may include the protrusion 251 of the aforementioned embodiment and a ring-shaped portion 252 connected to the protrusion 251. The ring-shaped portion 252 has one and only one positioning structure. The positioning structure is configured to locate the relative positions of the first and second basin frames 224 and 234 with respect to the mounting bracket 250. The positioning structure is a combination of a positioning protrusion 253 and a positioning groove 254. By way of example only, the ring-shaped portion 252 may include a main body 2521, a first connecting portion 2522, and a second connecting portion 2523. The first connecting portion 2522 is used to connect the main body 2521 to the first basin frame 224, and the second connecting portion 2523 is used to connect the main body 2521 to the second basin frame 234. Two positioning protrusions 253 are provided on the main body 2521. The two positioning protrusions 253 are arranged on both sides of the main body 2521 along the axial direction of the ring gap 252 (as shown by the arrows in Figure 16). The first connecting portion 2522 and the second connecting portion 2523 are both provided with positioning grooves 254 that adapt to the positioning protrusions 253. When the two positioning protrusions 253 are respectively embedded in the two positioning grooves 254, the first basin frame 224 and the second basin frame 234 can be aligned with the mounting bracket 250 so that the positions of the first solder pad 2242 and the second solder pad 2342 correspond to each other, facilitating the connection of the solder pads to the external wires and the connection of the solder pads to the coils. In other embodiments, the first basin frame 224 and the second basin frame 234 can be positioned in the mounting bracket 250 by other means. For example, a magnetic adsorption structure, a snap-on slot structure, etc.

[0123] In some embodiments, as shown in Figures 3, 12, and 13, a second sound transmission channel 213 is formed between the first and second frames 224, 234. The side of the first diaphragm 221 facing away from the first sound transmission channel 212 communicates with the second sound transmission channel 213 via a first air vent 2241. The side of the second diaphragm 231 facing away from the first sound transmission channel 212 communicates with the second sound transmission channel 213 via a second air vent. By way of example only, the end surface of the first frame 224 facing away from the first diaphragm 221 and the end surface of the second frame 234 facing away from the second diaphragm 231 both have gaps with the inner wall of the housing 210. This allows the second sound transmission channel 213 to be formed between the first and second frames 224, 234, and the housing 210, allowing acoustic communication between the cavity near the end surface of the first frame 224 facing away from the first diaphragm 221 and the cavity near the end surface of the second frame 234 facing away from the second diaphragm 231. The first diaphragm 221, the first frame 224, and the first magnetic shield 223 form a rear cavity of the first sound driver 220. The second diaphragm 231, the second frame 234, and the second magnetic shield 233 form a rear cavity of the second sound driver 230. The rear cavity of the first sound driver 220 and the rear cavity of the second sound driver 230 can be acoustically connected to the second sound transmission channel 213 through the first air vent 2241 and the second air vent, respectively. At this time, the rear cavity of the first sound driver 220, the rear cavity of the second sound driver 230, and the second sound transmission channel 213 can together form a cavity as the rear cavity of the sound-emitting part 21, which is equivalent to the shared rear cavity of the first sound driver 220 and the second sound driver 230.

[0124] In some cases, the rear cavity of the first sound driver 220 and the rear cavity of the second sound driver 230 are acoustically connected, and the airflow in the rear cavities of the two sound drivers can be discharged out of the shell 210 through the same pressure relief hole (for example, the pressure relief hole 217 in Figure 18), which can simplify the overall structure of the sound-emitting part 21 and reduce the manufacturing cost of the sound-emitting part 21.

[0125] Figure 17 is a schematic cross-sectional view of another sound-emitting portion along axial and radial planes, according to some embodiments of this specification. Unlike the sound-emitting portion 21 in Figure 12 , the two acoustic drivers (third acoustic driver 320 and fourth acoustic driver 330) of the sound-emitting portion 31 in Figure 17 share a rear cavity, and the rear cavities of the third and fourth acoustic drivers 320, 330 are acoustically connected to the sound outlet 340.

[0126] In some embodiments, the first sound driver 220 and the second sound driver 230 can share a front cavity and a rear cavity, thereby further simplifying the overall structure of the sound-emitting part 21 and reducing the manufacturing cost of the sound-emitting part 21.

[0127] FIG18 is a schematic diagram of the structure of an ear clip-on headphone according to some embodiments of the present specification. In some embodiments, as shown in FIG18 , the ear clip-on headphone 200 may further include a pressure relief hole 217. The pressure relief hole 217 is located on the housing 210 of the sound-emitting portion 21. As shown in FIG1 , FIG3 , FIG16 and FIG18 , when worn, the pressure relief hole 217 is located on the housing 210 near the ear hook 27 and facing the opening of the wearer's cavum conchae 102. In some embodiments, the pressure relief hole 217 is acoustically connected to the second sound transmission channel 213, and further acoustically connected to the back cavity of the first sound driver 220 and the second sound driver 230, so as to guide the sound in the back cavity to the outside, thereby balancing the sound pressure in the back cavity, so that the diaphragm of the sound-emitting portion 21 can fully vibrate at low frequencies and large amplitudes, ensuring the fullness of the low frequencies.

[0128] In some embodiments, as shown in Figures 16 and 18 , the end surface of the first frame 224 facing away from the first diaphragm 221 is provided with a plurality of first air holes 2241, and the plurality of first air holes 2241 are spaced apart around the first magnetic cover 223. The end surface of the first frame 224 facing away from the first diaphragm 221 is also provided with a plurality of first soldering pads 2242. The first soldering pads 2242 can be used to supply power to the first coil 226. The minimum distance between at least some of the first soldering pads 2242 and the pressure relief hole 217 is the first minimum distance, and the minimum distance between at least some of the first air holes 2241 and the pressure relief hole 217 is the second minimum distance, and the first minimum distance is greater than the second minimum distance. The distance between the first soldering pad 2242 and the pressure relief hole 217 refers to the distance between the centroid of the first soldering pad 2242 and the centroid of the pressure relief hole 217. The distance between the first vent hole 2241 and the pressure relief hole 217 refers to the distance between the centroid of the first vent hole 2241 and the centroid of the pressure relief hole 217 .

[0129] Similarly, the end surface of the second basin frame 234 facing away from the second diaphragm 231 is provided with a plurality of second air holes (not shown in the figure), and the plurality of second air holes are spaced around the second magnetic conductive cover 233. The end surface of the second basin frame 234 away from the second diaphragm 231 is also provided with a plurality of second soldering pads (not shown in the figure). The second soldering pads can be used to energize the second coil 236. The minimum distance between at least part of the second soldering pads and the pressure relief hole 217 is the third minimum distance, and the maximum distance between at least part of the second air holes and the pressure relief hole 217 is the fourth minimum distance, and the third minimum distance is greater than the fourth minimum distance.

[0130] In some cases, by placing the first air vent 2241 and the second air vent closer to the pressure relief hole 217, the airflow in the rear cavity of the first sound driver 220 and the second sound driver 230 can be discharged from the pressure relief hole 217 over a shorter distance, thereby improving the efficiency of releasing the air pressure in the rear cavity of the first sound driver 220 and the second sound driver 230 and improving the sound quality.

[0131] In other embodiments, the average distance from all first vents 2241 to the pressure relief hole 217 is a first average distance, and the average distance from all first solder pads 2242 to the pressure relief hole 217 is a second average distance, where the first average distance is less than the second average distance. Both of these approaches can also place the vents closer to the pressure relief hole 217 than the solder pads, allowing air in the rear cavity of the sound driver to be discharged from the pressure relief hole 217 via a shorter distance, thereby improving the efficiency of air pressure release in the rear cavity.

[0132] In some embodiments, the first minimum distance may be less than 1.5 mm, and the second minimum distance may be less than 0.8 mm. In some embodiments, the first minimum distance may be less than 1 mm, and the second minimum distance may be less than 0.6 mm. Similarly, in some embodiments, the third minimum distance may be less than 1.5 mm, and the fourth minimum distance may be less than 0.8 mm. In some embodiments, the third minimum distance may be less than 1 mm, and the fourth minimum distance may be less than 0.6 mm.

[0133] In some embodiments, as shown in Figure 18, the pressure relief hole 217 may include a first end 2171, a second end 2172 and a connecting section 2173 connecting the first end 2171 and the second end 2172. The first end 2171, the second end 2172 and the connecting section 2173 are arranged along the length direction of the pressure relief hole 217. The minimum width of the first end 2171 and the second end 2172 is greater than the maximum width of the connecting section 2172, so that the shape of the pressure relief hole 217 is similar to a "bone shape".

[0134] In some embodiments, as shown in conjunction with Figures 1, 5, and 18, the pressure relief holes 217 can be symmetrical with respect to the first symmetry plane A1. With this arrangement, whether the ear clip-on earphone 200 is worn on the wearer's left or right ear, the pressure relief effect of the pressure relief holes 217 will not be significantly affected.

[0135] In some embodiments, as shown in conjunction with Figures 1, 3, 16, and 18, when worn, the pressure relief hole 217 is further away from the ear canal than the sound outlet hole 240, thereby reducing the anti-phase cancellation between the sound output through the pressure relief hole 217 and the sound output through the sound outlet hole 240 at the ear canal, thereby increasing the volume of the sound heard by the wearer. In some embodiments, when the ear clip earphone 200 is worn, the sound outlet hole 240 faces the ear canal, while the pressure relief hole 217 faces away from the ear canal. Simultaneously, the housing 210 of the sound-emitting portion 21 abuts against the inner wall of the cavum concha 102, thereby isolating the sound outlet hole 240 from the pressure relief hole 217. This prevents the sound waves output from the pressure relief hole 217 from interfering with the sound waves output from the sound outlet hole 240, reduces sound short-circuiting, and improves sound quality.

[0136] Figure 19 is a schematic cross-sectional view of the sound-emitting portion along a plane parallel to the first plane of symmetry, according to some embodiments of the present disclosure. In some embodiments, as shown in conjunction with Figures 5, 18, and 19, an arcuate recessed section 271 is formed on the first plane of symmetry A1 between the inner side of the ear hook 27 and the housing 210 of the sound-emitting portion 21. The projection of the pressure relief hole 217 on the first plane of symmetry A1 is located in the arcuate recessed section 271. The curvature of the arcuate recessed section 271 is greater than a certain threshold, so that the inner contour of the housing 21 and the ear hook 27, corresponding to the arcuate recessed section 271, is sufficiently concave near the connection point between the housing 21 and the ear hook 27, thereby preventing the pressure relief hole 217 located at this recessed position from being blocked by the auricle.

[0137] In some embodiments, the pressure relief hole 217 and the sound inlet hole 280 can be arranged on opposite sides of the ear hook 27. For example, when wearing the ear clip earphones 200, the pressure relief hole 217 can be located on the side of the ear hook facing the antihelix, and the sound inlet hole can be located on the side of the ear hook 27 facing the tragus, so as to improve the sound reception effect of the microphone assembly, and when the pressure relief hole 217 and the sound inlet hole 280 are arranged relative to each other, the mutual interference between the two can be reduced.

[0138] Before connecting the first rigid shell 214 and the second rigid shell 215, it may be necessary to first connect and secure the integrated structure consisting of the two acoustic drivers and the mounting bracket 250 to the first rigid shell 214. To achieve this connection, in some embodiments, as shown in Figures 3 and 5 , a first step structure 218 and a second step structure 219 are provided on the inner side of the shell 210. The first step structure 218 abuts the first magnetic shield 223 or the first bracket 224. The second step structure 219 abuts the second magnetic shield 233 or the second bracket 234. By way of example only, the first step structure 218 and the second step structure 219 can be respectively provided on either side of a first symmetry plane A1 of the inner wall of the first rigid shell 214, with the first step structure 218 and the second step structure 219 being symmetrical with respect to the first symmetry plane A1. The first step structure 218 includes a first stop and a second stop. The first stop abuts the end surface of the first magnetic shield 223 facing away from the first diaphragm 221. The second stopper abuts against the outer wall of the first magnetic cover 223. The second step structure 219 includes a third stopper and a fourth stopper. The third stopper abuts against the end surface of the second magnetic cover 233 facing away from the second diaphragm 231. The fourth stopper abuts against the outer wall of the second magnetic cover 233.

[0139] The cooperation of the first and third retaining portions restricts axial movement (parallel to the direction of diaphragm vibration) of the integrated structure comprising the two acoustic drivers and the mounting bracket 250. The cooperation of the second and fourth retaining portions restricts radial movement (parallel to the radial direction of the first sound transmission channel 212) toward the ear hook 27. Furthermore, by providing a stepped structure that abuts the first and second magnetically conductive covers 223 and 233, the stepped structure prevents obstruction of the air vents, thereby improving pressure relief.

[0140] It should be noted that the first step structure 218 and the second step structure 219 shown in FIG3 are for illustrative purposes only and are not intended to limit the specific form of the structure for achieving positioning of the sound driver and the housing 210. For example, the sound driver can be positioned relative to the housing 210 using structures such as a magnetic assembly, a snap-fit ​​slot assembly, a guide slot and guide rod assembly, etc.

[0141] In some embodiments, the housing 210 of the ear clip-on headphones 200 is made of either a hard material (e.g., metal) or a flexible material (e.g., rubber). However, a housing 210 made of a hard material lacks wearing comfort, while a housing 210 made of a flexible material provides poor support and protection for the structures contained within the housing 210, and thus cannot effectively meet the functional requirements of the ear clip-on headphones 200. To address the above issues, some embodiments of the present specification provide ear clip-on headphones 200 in which the sound-producing portion 21 of the housing 210 (i.e., the accommodating chamber 211) is enclosed by a hard material, while a flexible body 216 is provided on the surface of the housing 210 that contacts the wearer's cavum concha. This ensures wearing comfort while improving the support and protection of the components contained within the housing 210, thereby enhancing the sound quality of the ear clip-on headphones 200.

[0142] In some embodiments, as shown in conjunction with FIG3 and FIG19 , the housing 210 may include a first hard shell 214, a second hard shell 215, and a flexible body 216. The second hard shell 215 is configured to face the wearer's cavum concha when worn. The flexible body 216 is configured to contact the wearer's cavum concha when worn. The first hard shell 214 and the second hard shell 215 enclose a housing cavity 211. The flexible body 216 covers the outer wall of the second hard shell 215.

[0143] In this embodiment, the accommodating cavity 211 is enclosed by a first hard shell 214 and a second hard shell 215, and both the first hard shell 214 and the second hard shell 215 are made of hard materials. Therefore, the first hard shell 214 and the second hard shell 215 can better support and fix the components in the accommodating cavity 211 (for example, the first sound driver 220 and the second sound driver 230), effectively preventing external pressure from causing the accommodating cavity 211 to deform and squeeze the components in the accommodating cavity 211, thereby improving the structural strength of the sound-emitting part 21 and improving the sound quality. In addition, because the flexible body 216 covers the outer wall of the second hard shell 215, when the wearer wears the earphones, the flexible body 216 can contact the wearer's cavum concha, preventing the hard shell from directly contacting the cavum concha and affecting the wearing feel, thereby effectively improving wearing comfort. At the same time, since the flexible body 216 mainly covers the outer wall of the second hard shell 215, it basically does not affect the external structure and internal space of the first hard shell 214, and can reduce the overall volume of the shell 210 while ensuring wearing comfort.

[0144] In some embodiments, the first hard shell 214 and the second hard shell 215 can be made of plastic, metal, or other materials that can be used as a support for the earphone housing 210. In some embodiments, the first hard shell 214 and the second hard shell 215 can be made of the same hard material. In some embodiments, the first hard shell 214 and the second hard shell 215 can be made of different hard materials.

[0145] In some embodiments, the material for making the flexible body 216 is not limited to silicone, rubber, elastic resin, polyurethane, polydimethylsiloxane, PVC, TPE and other materials.

[0146] It should be noted that the housing 210 shown in Figures 3 and 19 is for illustrative purposes only and is not intended to limit the configuration of the flexible body 216 in the embodiments of this specification. In some embodiments, the flexible body 216 is provided on the exposed outer wall of the second rigid housing 215, except for the connection with the first rigid housing 214, as shown in Figures 5 and 19. In other embodiments, the flexible body 216 is provided on a portion of the exposed outer wall of the second rigid housing 215, except for the connection with the first rigid housing 214. By way of example only, the outermost loop of the end surface of the flexible body 216 lies on the plane of the first reference plane A6. In a cross section perpendicular to the first reference plane A6 and passing through the center of the first reference plane A6 (for example, the cross section can be parallel to the first symmetry plane A1, or the cross section can be the first symmetry plane A1), the coverage area of ​​the second rigid housing 215 by the flexible body 216 is greater than or equal to 80% of the curved length of the second rigid housing 215. In another example, the earhook symmetry plane (i.e., first symmetry plane A1) and the outermost loop of the end surface of the flexible body 216 have two intersection points. In a cross section perpendicular to the earhook symmetry plane A1 and passing through the two intersection points, the coverage area of ​​the second hard shell 215 by the flexible body 216 is greater than or equal to 80% of the curved length of the second hard shell 215. The above two examples describe the proportion of the flexible body 216 on the second hard shell 215 from two perspectives, respectively, so that the flexible body 216 can cover a sufficiently large area of ​​the second hard shell 215 to reduce or eliminate the possibility of direct contact between the wearer and the second hard shell 215.

[0147] In some embodiments, the first hard shell 214 and the second hard shell 215 can be connected by splicing, welding, snap-fit ​​connection, magnetic connection, etc. As an example only, the end of the second hard shell 215 is spliced ​​and fixed to the end of the first hard shell 214. The end of the second hard shell 215 is fixed to the end of the first hard shell 214 by splicing to form a reliable and compact fixed relationship. This splicing method also facilitates assembly and reduces the assembly process.

[0148] In the embodiments shown in Figures 3 and 19 , since the flexible member 216 is provided on the outer wall of the second rigid shell 215, the wall thickness of this portion of the shell 210 is the sum of the wall thicknesses of the second rigid shell 215 and the flexible member 216. However, since the flexible member 216 is not provided on the outer wall of the first rigid shell 214, or the flexible member 216 is provided only on the outer wall of the first rigid shell 214 near the second rigid shell 215 (e.g., the portion where the first rigid shell 214 and the second rigid shell 215 connect), the wall thickness of this portion of the shell 210 can be considered to be the same as, or approximately the same as, the wall thickness of the first rigid shell 214. Due to the small volume of the cavum conchae, given the limited overall size of the shell 210, the lack of a flexible member on the outer wall of the first rigid shell 214 allows the overall wall thickness of this portion of the shell 210 to be reduced, effectively increasing the internal volume of the first rigid shell 214 and accommodating a larger diaphragm area, thereby achieving a better acoustic effect.

[0149] Furthermore, due to the increased internal space of the first rigid shell 214, the shape and size of the accommodating chamber 211 are correspondingly changed. To more fully utilize the internal space of the accommodating chamber 211, the arrangement of the first acoustic driver 220 and the second acoustic driver 230 needs to be adjusted. The embodiments of this specification will describe the changes in the arrangement of the first acoustic driver 220 and the second acoustic driver 230 in conjunction with Figures 10 and 19 and their respective embodiments.

[0150] In some embodiments, in order to fully utilize the internal space of the accommodating cavity 211, the midpoint Q of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231 can roughly coincide with the center of the accommodating cavity 211. The center of the diaphragm refers to the centroid of the plane where the diaphragm is located. Roughly coincident means that the distance between the two does not exceed a preset value, for example, 5 mm, 3 mm, 1 mm, etc. As an example only, if the shape of the accommodating cavity 211 is a sphere, and the axial and radial dimensions of the overall structure composed of the first sound driver 220, the second sound driver 230 and the mounting bracket 250 are close, then when the midpoint Q of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231 coincide with the center of the accommodating cavity 211, the spatial dimensions of the accommodating cavity 211 can be more fully utilized. When the flexible body 216 is not provided, the center of the shell 210 and the center of the accommodating cavity 211 can be considered to basically coincide. However, after the flexible member 216 is provided on the outer wall of the second rigid shell 215, the center position of the entire shell 210 changes, and thus the midpoint Q of the line connecting the centers of the first diaphragm 221 and the second diaphragm 231 also deviates from the center of the entire shell 210. It should be noted that the first diaphragm 221 and the second diaphragm 231 may not be exactly the same or completely symmetrical with respect to the first symmetry plane A1. For example, the first diaphragm 221 and the second diaphragm 231 may be approximately identical. In another example, the first diaphragm 221 and the second diaphragm 231 may be approximately symmetrical with respect to the first symmetry plane A1 (i.e., not completely symmetrical).

[0151] In some embodiments, the plane on which the outermost loop of the end surface of the flexible body 216 lies is the first reference plane A6, and the midpoint Q of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231 lies outside the first reference plane A6. In this embodiment, the plane on which the outermost loop of the end surface of the flexible body 216 lies corresponds to the interface between the interior space of the flexible body 216 and the interior space of the first rigid shell 214. When the shape and size of the interior space of the flexible body 216 are identical or approximately identical to those of the interior space of the first rigid shell 214, the midpoint Q of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231 substantially coincides with the center of the accommodating cavity 211 and the center of the shell 210. Therefore, the midpoint Q of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231 can be considered to be located on the first reference plane A6 or to be at a relatively short distance from the first reference plane A6, thereby fully utilizing the space of the accommodating cavity 211. Since the second hard shell 215 is further provided in the flexible body 216 , the center of the shell 210 deviates from the center of the accommodating cavity 211 , so the midpoint Q of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231 is located outside the first reference plane A6 .

[0152] In some embodiments, the plane on which the outermost loop of the end surface of the second rigid shell 215 lies is a second reference plane (not shown), and the midpoint Q of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231 is located outside the second reference plane. The plane on which the outermost loop of the end surface of the second rigid shell 215 lies corresponds to the interface between the interior space of the second rigid shell 215 and the interior space of the first rigid shell 214. When the shape and size of the interior space of the second rigid shell 215 are the same or approximately the same as those of the interior space of the first rigid shell 214, and the flexible body 216 is not provided, the midpoint Q of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231 substantially coincides with the center of the accommodating cavity 211 and the center of the shell 210. Therefore, the midpoint Q of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231 can be considered to be located on the second reference plane or to be at a relatively short distance from the second reference plane. When the flexible body 216 covers the outer wall of the second hard shell 215, the center position of the entire shell 210 changes, so the midpoint Q of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231 deviates from the center of the entire shell 210. Therefore, the midpoint Q of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231 is located outside the second reference plane.

[0153] The above two embodiments illustrate the changes in the position of the midpoint Q of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231, respectively, using the second hard shell 215 and the flexible body 216 as references. This demonstrates that the ear clip-on headphone 200 provided in some embodiments of this specification can improve the utilization efficiency of the internal space of the shell 210 by rationally arranging the components within the shell 210 of the sound-emitting portion 21, while ensuring wearing comfort.

[0154] In combination with Figures 5 and 19, in some embodiments, the projection of the midpoint of the line connecting the center of the first diaphragm 221 and the center of the second diaphragm 231 on the first symmetry plane A1 is the first projection point P1, the intersection of the first reference plane A6 and the first symmetry plane A1 is the first intersection line, and the distance between the first projection point P1 and the first intersection line is in the range of 0.4mm-4mm.

[0155] In some embodiments, the projection of the inner wall of the accommodating cavity 211 on the first symmetry plane A1 is a first projection, and the projection of the first reference plane A6 on the first symmetry plane A1 is a second projection. The first projection and the second projection have a first intersection point P2 and a second intersection point P3, and the distance between the first intersection point P2 and the second intersection point P3 is the intersection distance. The first projection includes a first arc segment R1 and a second arc segment R2, and the ratio of the first arc segment R1 and the second arc segment R2 to the intersection distance is between 1.4 and 1.7. Because the ratio of the first arc segment R1 and the second arc segment R2 to the intersection distance is between 1.4 and 1.7, the first arc segment R1 and the second arc segment R2 are both approximately semicircular. That is, the projection of the accommodating cavity 211 on the first symmetry plane A1 is closer to a sphere, making the overall shape of the sound-emitting portion 21 spherical or approximately spherical, thereby making the sound-emitting portion 21 more compatible with the cavum conchae and improving the wearing comfort of the ear clip-on earphone 200.

[0156] In some embodiments, the sound hole 240 may be located on the first hard shell 214. In some embodiments, the sound hole 240 may be located on the second hard shell 215 and the flexible body 216. In some embodiments, the sound hole 240 may be located on all three of the first hard shell 214, the second hard shell 215, and the flexible body 216.

[0157] As an example, as shown in Figures 2 and 3 , the sound hole 240 is located on the second hard shell 215 and the flexible body 216. This arrangement eliminates the need for the sound hole 240 to penetrate both the first hard shell 214 and the second hard shell 215, thus preventing uneven surfaces of the sound hole 240 that could affect the installation of the shell 210. Furthermore, when wearing the ear clip earphone 200, the sound hole 240 can be closer to the ear canal, effectively improving sound quality.

[0158] In another example, the sound hole 240 can be located in the first rigid shell 214. This eliminates the need for the sound hole 240 to penetrate both the first rigid shell 214 and the second rigid shell 215, thus preventing uneven surfaces on the sound hole 240 that could affect the installation of the shell 210. Furthermore, the placement of the sound hole 240 in the first rigid shell 214 eliminates the need to drill holes in the flexible body 216, nor does it require consideration of the impact of the flexible body 216 on the sound hole 240, thus reducing design and production costs.

[0159] The basic concepts have been described above. It will be apparent to those skilled in the art that the detailed disclosure above is merely illustrative and does not limit the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and amendments to the present application. Such modifications, improvements, and amendments are suggested in the present application and remain within the spirit and scope of the exemplary embodiments of the present application.

Claims

1. An ear clip type earphone, comprising: The sound-generating part is configured to be inserted into the wearer's concha cavity when worn, and the sound-generating part includes: A housing having a receiving cavity; A first sound driver and a second sound driver are accommodated together in the accommodating cavity, and a first sound transmission channel is formed between a first diaphragm of the first sound driver and a second diaphragm of the second sound driver; a sound outlet hole, located on the housing, the sound outlet hole being acoustically connected to the first sound transmission channel and conducting the sound generated by the first sound driver and the second sound driver; an abutment portion, configured to abut behind the ear of the wearer when worn; The ear hook is configured to bypass the antihelix and the auricle of the wearer when worn, and connect the sound-generating part and the abutting part.

2. The ear clip headphone according to claim 1, wherein the ear hook has a first symmetry plane, the first diaphragm and the second diaphragm are respectively located on both sides of the first symmetry plane, and the first diaphragm and the second diaphragm are symmetrical with respect to the first symmetry plane. 3 . The ear-clip earphone according to claim 2 , wherein the first symmetry plane passes through the sound outlet hole.

4. The ear-clip headphone according to claim 1, wherein the ear hook has a first symmetry plane, the first diaphragm and the second diaphragm are symmetrical with respect to the second symmetry plane, and an inclination angle less than 45 degrees is formed between the first symmetry plane and the second symmetry plane.

5. According to the ear clip earphone according to claim 1, the sound outlet is symmetrical with respect to a third symmetry plane, the third symmetry plane is perpendicular to the inner wall of the concha cavity, and an inclination angle less than 45 degrees is formed between the first symmetry plane and the third symmetry plane.

6. The ear-clip earphone according to claim 4 or 5, wherein when the wearer wears the ear-clip earphone, the sound outlet is completely located on a side of the first symmetry plane that is closer to the wearer's earlobe.

7. The ear clip headphone according to claim 1, wherein the ear hook has a first symmetry plane, the first diaphragm and the second diaphragm are symmetrical with respect to a fourth symmetry plane, and the fourth symmetry plane is perpendicular to the first symmetry plane.

8. The ear-clip earphone according to claim 7, wherein when the wearer wears the ear-clip earphone, the sound outlet is completely located on a side of the first symmetry plane that is closer to the wearer's earlobe.

9. According to the ear-clip earphone according to claim 7, the central axis of the sound outlet hole coincides with the central axis of the first sound transmission channel; the cross-sectional shape of the sound outlet hole perpendicular to the direction of its own central axis is the same as the cross-sectional shape of the first sound transmission channel perpendicular to the direction of its own central axis, and the entrance of the sound outlet hole is aligned with the opening of the first sound transmission channel. 10 . The ear clip headphone according to claim 1 , wherein the first acoustic channel is a common front cavity of the first diaphragm and the second diaphragm.

11. The ear-clip headphone according to claim 10, wherein the first sound driver comprises a first magnet and a first magnetic shield which are sequentially arranged away from the first diaphragm, and a first basin frame for supporting the first diaphragm, the first magnet and the first magnetic shield; The second sound driver includes a second magnet and a second magnetic conductive cover which are arranged in sequence away from the second diaphragm, and a second basin frame for supporting the second diaphragm, the second magnet and the second magnetic conductive cover.

12. According to the ear-clip earphone according to claim 11, a second sound transmission channel is formed between the first basin and the second basin, the first basin includes a plurality of first air holes, the second basin includes a plurality of second air holes, the side of the first diaphragm away from the first sound transmission channel is connected to the second sound transmission channel through the plurality of first air holes, and the side of the second diaphragm away from the first sound transmission channel is connected to the second sound transmission channel through the plurality of second air holes. 13 . The ear clip headphone according to claim 11 , wherein the sound emitting portion further comprises a mounting bracket, and the first acoustic driver and the second acoustic driver are mounted on the mounting bracket together.

14. The ear-clip earphone according to claim 13, wherein a protrusion is provided at a position of the mounting bracket corresponding to the sound outlet, and the protrusion abuts against an inner wall of the shell.

15. The ear-clip earphone according to claim 14, wherein the protrusion is provided with a through hole, a first cross section of the through hole is flush with an end surface of the first basin frame, and a second cross section of the through hole is flush with an end surface of the second basin frame.

16. The ear-clip earphone according to claim 14, wherein the mounting bracket comprises the protrusion and a ring-shaped portion connected to the protrusion, wherein the ring-shaped portion has one and only one positioning structure, and the positioning structure is configured to position the first basin and the second basin with the mounting bracket, and the positioning structure is a combination of a positioning protrusion and a positioning groove.

17. According to the ear clip earphone according to claim 13, the maximum axial distance of the structure composed of the first sound driver, the second sound driver and the mounting bracket is a first dimension, the maximum radial distance of the structure composed of the first sound driver, the second sound driver and the mounting bracket is a second dimension, and the ratio of the first dimension to the second dimension is in the range of 0.85 to 1.

15.

18. The ear-clip headphone according to claim 12, wherein the shell is provided with a pressure relief hole acoustically connected to the second sound transmission channel.

19. The ear-clip headphone according to claim 18, wherein a plurality of first solder pads are disposed on an end surface of the first frame facing away from the first diaphragm, a minimum distance between at least some of the first solder pads and the pressure relief hole is a first minimum distance, a minimum distance between at least some of the air holes and the pressure relief hole is a second minimum distance, and the first minimum distance is greater than the second minimum distance; A plurality of second welding pads are provided on the end surface of the second basin frame facing away from the second diaphragm, the minimum distance between at least some of the second welding pads and the pressure relief hole is the third minimum distance, the maximum distance between at least some of the second air holes and the pressure relief hole is the fourth minimum distance, and the third minimum distance is greater than the fourth minimum distance.

20. The ear-clip earphone according to claim 18, wherein the ear hook has a first symmetry plane, and the sound outlet hole, the first sound transmission channel and the pressure relief hole are all symmetrical relative to the first symmetry plane.

21. The ear clip earphone according to claim 18, wherein when the ear clip earphone is worn, the pressure relief hole and the sound outlet hole are acoustically isolated by the inner wall of the concha cavity.

22. According to the ear-clip earphone according to claim 18, the pressure relief hole includes a first end, a second end and a connecting section connecting the first end and the second end, the first end, the second end and the connecting section are arranged along the length direction of the pressure relief hole, and the minimum width of the first end and the second end is greater than the maximum width of the connecting section.

23. According to the ear-clip earphone according to claim 11, a first step structure and a second step structure are provided on the inner side of the shell, the first step structure abuts against the first magnetic conductive cover or the first basin frame of the first acoustic driver; the second step structure abuts against the second magnetic conductive cover or the second basin frame of the second acoustic driver.

24. The ear-clip headphone according to claim 23, wherein the first step structure comprises a first stopper and a second stopper, the first stopper abuts against an end surface of the first magnetic conductive cover facing away from the first diaphragm, and the second stopper abuts against an outer side wall of the first magnetic conductive cover; The second step structure includes a third stopper and a fourth stopper, the third stopper abuts against an end surface of the second magnetic conductive cover facing away from the second diaphragm, and the fourth stopper abuts against an outer side wall of the second magnetic conductive cover.

25. The ear-clip headphone according to claim 13, wherein the first basin, the second basin and the mounting bracket are filled with glue to seal.

26. The ear clip headphone according to claim 1, wherein the resonance frequency of the first diaphragm and the resonance frequency of the second diaphragm are both lower than 300 Hz, and the difference between the resonance frequency of the first diaphragm and the resonance frequency of the second diaphragm is less than 50 Hz.

27. The ear clip headphone according to claim 11, wherein the first sound driver further comprises a first coil disposed in the first basin, the first coil is disposed around the side wall of the first magnet, and one end of the first coil is connected to the first diaphragm; the second sound driver further comprises a second coil disposed in the second basin, the second coil is disposed around the side wall of the second magnet, and one end of the second coil is connected to the second diaphragm; The ear hook has a first symmetric plane, the first basin is the same as the second basin and is symmetrical with respect to the first symmetric plane, the first magnetic conductive cover is the same as the second magnetic conductive cover and is symmetrical with respect to the first symmetric plane, and the first coil is the same as the second coil and is symmetrical with respect to the first symmetric plane.

28. The ear-clip headphone according to claim 1, wherein the housing comprises: a first hard shell; A second hard shell is configured to be disposed toward the wearer's concha cavity when worn; a flexible body configured to contact the wearer's concha cavity when worn; The first hard shell and the second hard shell enclose the accommodating cavity, and the flexible body covers the outer wall of the second hard shell.

29. According to the ear-clip earphone according to claim 28, the plane where the outermost loop line of the end surface of the flexible body lies is the first reference plane, and the midpoint of the line connecting the center of the first diaphragm and the center of the second diaphragm is located outside the first reference plane; or the plane where the outermost loop line of the end surface of the second hard shell lies is the second reference plane, and the midpoint of the line connecting the center of the first diaphragm and the center of the second diaphragm is located outside the second reference plane.

30. According to the ear clip headphone according to claim 29, the ear hook has a first symmetry plane, the projection of the midpoint of the line connecting the center of the first diaphragm and the center of the second diaphragm on the first symmetry plane is a first projection point, the intersection of the first reference plane and the first symmetry plane is a first intersection line, and the distance between the first projection point and the first intersection line is in the range of 0.4mm to 4mm.

31. The ear-clip earphone according to claim 28, wherein the sound outlet is located on the second hard shell and the flexible body.

32. According to the ear-clip earphone according to claim 29, the projection of the inner wall of the accommodating cavity on the first symmetry plane is the first projection, the projection of the first reference plane on the first symmetry plane is the second projection, the first projection and the second projection have a first intersection and a second intersection, and the distance between the first intersection and the second intersection is the intersection distance; the first projection includes a first arc segment and a second arc segment, and the ratios of the first arc segment and the second arc segment to the intersection distance are both between 1.4 and 1.

7.

33. The ear-clip earphone according to claim 1, further comprising a microphone assembly, wherein the microphone assembly is disposed in the ear hook, and the microphone assembly forms a third sound transmission channel; a sound inlet hole is disposed on one side of the ear hook close to the sound-emitting part, and the sound inlet hole is acoustically connected to the third sound transmission channel; the ear hook has a first symmetry plane, and the sound inlet hole is symmetrical with respect to the first symmetry plane.

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